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Niobium micro-alloyed wear-resisting cast steel material, application thereof and preparation method thereof

A technology of microalloying and cast steel, applied in its application and preparation, cast steel materials, and wear-resistant cast steel materials, can solve the problem of unsatisfactory strength and toughness of chromium wear-resistant cast steel, low hardness of chromium carbides, and increased alloy cost And other problems, to achieve enhanced solid solution strengthening effect, high hardenability, and reduce the effect of quenching stress

Inactive Publication Date: 2019-03-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and toughness of the current niobium-containing medium-chromium wear-resistant cast steel are not ideal. The hardness of the chromium carbides in the matrix is ​​low, and the content of niobium is high, which increases the cost of the alloy, and the comprehensive mechanical properties need to be improved.

Method used

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  • Niobium micro-alloyed wear-resisting cast steel material, application thereof and preparation method thereof
  • Niobium micro-alloyed wear-resisting cast steel material, application thereof and preparation method thereof
  • Niobium micro-alloyed wear-resisting cast steel material, application thereof and preparation method thereof

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Embodiment 1

[0022] In this embodiment, a method for preparing a niobium microalloyed wear-resistant cast steel material, a method for preparing a wear-resistant steel casting based on niobium alloying, mainly includes a smelting process, a casting process and a heat treatment process, including the following steps :

[0023] a. Raw material preparation process: use scrap steel, ferrochromium, ferrosilicon, ferroniobium, pure chromium, pure molybdenum, and pure manganese as raw materials, and clean up each raw material, according to the composition of the prepared niobium microalloyed wear-resistant cast steel material According to the requirement of proportion and mass percentage, ingredients are carried out, and each raw material is dried for use; the composition of the wear-resistant material measured in the present embodiment is as follows in Table 1:

[0024] Table 1. Composition analysis of the selected ingot raw materials in this embodiment

[0025]

[0026] b. Smelting process:...

Embodiment 2

[0030] This embodiment is basically the same as Embodiment 1, especially in that:

[0031] In this embodiment, a method for preparing a niobium microalloyed wear-resistant cast steel material, a method for preparing a wear-resistant steel casting based on niobium alloying, mainly includes a smelting process, a casting process and a heat treatment process, including the following steps :

[0032] a. This step is the same as in Embodiment 1;

[0033]b. Smelting process: use a 25kg class induction melting furnace to melt the dry raw materials obtained in step a, and carry out vacuuming and anti-oxidation treatment on the furnace cavity of the induction melting furnace before melting; carry out induction melting to the raw materials At the time, first add steel scrap, ferrochromium, ferrosilicon, ferroniobium, pure chromium and pure molybdenum into the induction melting furnace for melting; after the raw materials are melted, a metal melt containing a trace amount of niobium allo...

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Abstract

The invention discloses a niobium micro-alloyed wear-resisting cast steel material, application thereof and a preparation method thereof, and the niobium micro-alloyed wear-resisting cast steel material is suitable for manufacturing a niobium alloying effect based wear-resisting cast steel part of a ball mill lining plate. The niobium micro-alloyed wear-resisting cast steel material comprises alloy components, and a thermal treatment process, and belongs to the technical field of metal material processes. The niobium micro-alloyed wear-resisting cast steel material consists of the following components in percentage by mass: 0.45-0.55% of C, 0.95-1.05% of Si, 1.5-1.6% of Mn, 4.2-4.8% of Cr, 0.75-0.80% of Mo, 0.15-0.20% of Nb, less than or equal to 0.02% of S, less than or equal to 0.03% ofP and the balance of Fe. An element niobium is added to obtain fine discontinuously-distributed niobium carbide, so that the effects of solid solution strengthening and grain boundary pinning are achieved, and therefore, hardness, impact toughness and tensile strength of the material are matched and improved very well, a wear-resisting lining plate material with stable performance is obtained under an air-cooling way, and the process is simple and environmentally friendly.

Description

technical field [0001] The invention relates to a cast steel material, its application and preparation method, in particular to a wear-resistant cast steel material, its application and preparation method, and is applied in the technical field of metal material technology. Background technique [0002] Because the bottom of the liner of the ball mill is often impacted by abrasives, it is particularly important to have good impact toughness while ensuring wear resistance. Commonly used liner materials include high manganese steel, high chromium cast iron, alloy cast steel, etc. In the working condition of the ball mill liner, high manganese steel cannot provide enough hardness to ensure wear resistance, and is easy to deform. Hard carbide Cr in high chromium cast iron 7 C 3 Guaranteed wear resistance, but the toughness is generally low, and the alloy content is high, and the production cost is relatively high. Martensitic alloy steel has better wear resistance than high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D6/00C21D9/00C22C33/06C22C38/02C22C38/22C22C38/26C22C38/38
CPCC21D1/18C21D1/26C21D6/002C21D6/005C21D6/008C21D9/0081C22C33/06C22C38/002C22C38/02C22C38/22C22C38/26C22C38/38Y02P10/20
Inventor 杨弋涛张拓
Owner SHANGHAI UNIV
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